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                        为什么要使用WEB框架
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                            <b>2.2.</b>
                        
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                            <b>3.</b>
                        
                        数据库
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                            <b>3.1.</b>
                        
                        Flask中使用数据库
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                            <b>3.2.</b>
                        
                        数据库基本操作
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                            <b>3.3.1.</b>
                        
                        定义模型&amp;创建表&amp;数据添加
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                        数据显示&amp;表单添加
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                        添加数据的表单验证
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                        删除数据
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